When I try to copy a folder with a large number of files from a samba share to the local drive, there is a extremly long time between consecutive file transfers. The file itself is transferred with full speed (~7MB/sec, which is the limit of the WiFi). Before transferring the first file and between the files Nemo waits around 30sec.

There is no problem, when...
...I copy these folders with cp in the console
...I copy these folders from the local drive to the samba share.

I observed this behavior on an actual Linux Mint 18.3 with all updates and a fresh Mint 19. The problem didn't exist on a fresh installation of Mint 18.3 (directly from the image) before any updates were applied.

System is a Lenovo X230 laptop, connected via WiFi.

Any ideas would be appreciated.

BR,
Zephyroth

09-20-2015 was a great day: I switched to Linux and left Windows behind...

The problem only occurs with the SMB protocol version 2.0 and higher. This also explained why a fresh installed Mint 18.3 worked (Kernel 4.9), while updating (actual kernel 4.13) and Mint 19 (min. kernel 4.12) didn't. With kernel 4.12 the default for a cifs mount was changed from 1.0 to 3.0. When you don't specify the CIFS version to use, 3.0 is used, which causes the described problems with graphical file managers.

With the parameter vers=1.0 in the fstab, everything is fine, although this is an old and not recommended protocol version. At least it works.

BR,
Zeph

09-20-2015 was a great day: I switched to Linux and left Windows behind...